There's no point having slick tires if your running a 50cc engine. The CPU feeds the GPU - if the CPU is slow, then it becomes the limiting factor. It depends if the game uses the CPU more than the GPU. The GPU is only good for vector and parallel tasks - for all the more complex stuff, some of it has to be handed off to the CPU. If the GPU is waiting for the CPU, then OCing your CPU makes more of a difference than OCing the GPU.

Ofcourse, I understand this.
But for single GPU users like me, an overclocked 2500K to 4,5Ghz should always be enough and should never be a limiting factor...

Ofcourse, I understand this.
But for single GPU users like me, an overclocked 2500K to 4,5Ghz should always be enough and should never be a limiting factor...

Completely agree

CPU are just not such a big deal these days with MOST games, I remember reading a review at hardwareheaven I think a few months back which i felt pretty conclusively showed that while a 'current' CPU might limit Max FPS the underline average will not change..... So while you may get a better average fps, this is just caused by a higher possible max frame rate IE for 10 secs of the VGA game test you may get a max of 120FPS instead of 80FPS... While this does affect the average it does not affect the game play ......

Unless you CPU is completely dud in most case it really should not be a big issue at all, all does is limit the range most of the time.........

So no its a bit more like buying a supercar for your daily shopping trips you may have alot more power under the hood but its completely useless for the task at hand.

3x 7970s occupying Three full 16 lanes,
overclocking by increasing the FSB and PCIe Frequency basically is the equivalent of raising the speed limit on a highway.
More data can flow through in the same lanes in the same amount of time as before. now, times that by 3 for Tri-Crossfire.

Considering a 7970 does not saturate a 16x lane - increasing the bandwidth is going to be of no help if you cannot take advantage of it. That is like adding a third lane to a highway that has only enough traffic for 2 so the 3rd lane goes unused.

So i successfully converted my Sapphire Reference HD7970 to a Sapphire Dual-X HD7970 (well at least in appearance)
Dropped temps by at least 10C. i did try flashing the Dual-X's 1000MHz/1450MHz Bios onto this card but im guessing the bios is somehow tailored for the full VRM stack on the Dual-X PCB . it flashed just fine and the PC would boot up just fine, but the card shut itself off once you got to the desktop (it runs 1000/1450 just fine otherwise). so anyone else out there thinking about doing this, Don't.